What are your rpm. @70mph

[mccor023]

I realize this may be a stupid question, and I would have searched... But, I just want to ask I finally have a working at after owning my 89 325i and Im at 33-3500rpm at 70. I would just like to know if this is normal or if I should look for a new diff because I do a lot of highway.
Thank you in advance.

[ak-]

Sounds like you have a 4.10 diff. Yeah, that's "normal".

[McGyver]

same as me matt. its annoying, but oh well.

[Killacortes]

If you do alOt of highway 4.10 is not the right diff for you.

[mccor023]

I thought only the "is" came with the 4.10? I thought the i came with a 3.73 or similar!?

[Kershaw]

the S just denotes where it's an LSD or not.

325i/is manual = 3.73
325i/is auto = 4.10
325e/es = 2.93 and 2.79
318i/is = 4.10, and i thought some 318i cabrios came with a 4.33 iirc.

[mccor023]

the S just denotes where it's an LSD or not.

325i/is manual = 3.73
325i/is auto = 4.10
325e/es = 2.93 and 2.79
318i/is = 4.10, and i thought some 318i cabrios came with a 4.33 iirc.

Thats what I had seen. Mine is manual not auto.

[ZekeTheSneak]

My 3.73 is the same. Sucks but ive driven it real far with no ill effects. Washington to cali only stopping for gas

[E30ruben]

I have the 92 318i cabrio manual and at 70 I'm sitting at 33-ish.. 75 is 3.5k

[nando]

3500 with a 4.10 is 75 mph, not 70.

[KenC]

Just drove from Portland to LA with a 4.44 diff. 4300RPMs at 85mph... for 14hrs

[LowR3V'in]

at 70mph?
2,200rpm. I love my 2.93 :)

[sofargone561]

my honda i drive at 90-100 to work on most days im at about 5k lol 3k is fucking perfect at 70mph

[DaveE30Mayne]

I thought only the "is" came with the 4.10? I thought the i came with a 3.73 or similar!?

im pretty sure you have a 3.73 bcuz i run about 33-3500 in my 1987 325i vert and I have a 3.73.

[nando]

^at 70mph? do you have tires that are 2" diameter undersized? :|